Abstract
Background
Chronic kidney disease (CKD) is a serious health threat worldwide. Defective mitophagy has been reported to induce mitochondrial dysfunction, which is closely associated with CKD pathogenesis. Honokiol (HKL) is a bioactive component of Magnolia officinalis that has multiple efficacies. Our study aimed to investigate the effect of HKL on a CKD rat model and explore the possible mechanisms of mitophagy mediated by Bcl-2 interacting protein 3 and BNIP3-like (NIX) (also known as the BNIP3/NIX pathway) and FUN14 domain-containing 1 (the FUNDC1 pathway) and the role of the AMP-activated protein kinase (AMPK) pathway.
Methods
A CKD rat model was established by feeding the animals dietary adenine (0.75% w/w, 3 weeks). Simultaneously, the treatment group was given HKL (5 mg/kg/day, 4 weeks) by gavage. Renal function was assessed by measuring serum creatinine (Scr) and blood urea nitrogen (BUN) levels. Pathological changes were analyzed by periodic acid-Schiff (PAS) and Masson’s trichrome staining. Protein expression was evaluated by Western blotting and immunohistochemistry.
Results
HKL treatment ameliorated the decline in renal function and reduced tubular lesions and interstitial fibrosis in CKD rats. Accordingly, the renal fibrosis markers Col-IV and α-SMA were decreased by HKL. Moreover, HKL suppressed the upregulation of the proapoptotic proteins Bad and Bax and Cleaved caspase-3 expression in CKD rats. Furthermore, HKL suppressed BNIP3, NIX and FUNDC1 expression, leading to the reduction of excessive mitophagy in CKD rats. Additionally, AMPK was activated by adenine, and HKL reversed this change and significantly decreased the level of activated AMPK (phosphorylated AMPK, P-AMPK).
Conclusion
HKL exerted a renoprotective effect on CKD rats, which was possibly associated with BNIP3/NIX and FUNDC1-mediated mitophagy and the AMPK pathway.
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Data availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- AKI:
-
Acute kidney injury
- AMPK:
-
AMP-activated protein kinase
- BNIP3:
-
Bcl-2 interacting protein 3
- BUN:
-
Blood urea nitrogen
- CKD:
-
Chronic kidney disease
- Col-IV:
-
Type IV collagen
- DALYs:
-
Disability-adjusted life years
- ESRD:
-
End-stage renal disease
- FUNDC1:
-
FUN14 domain containing 1
- HKL:
-
Honokiol
- I/R:
-
Ischemia–reperfusion
- NIX:
-
BNIP3-like
- PAS:
-
Periodic acid-Schiff
- PINK1:
-
Phosphatase with tensin homolog (PTEN)-induced kinase 1
- RASIs:
-
Renin-angiotensin system inhibitors
- Scr:
-
Serum creatinine
- TCM:
-
Traditional Chinese medicine
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Funding
This study was supported by the Shenzhen Science and Technology Plan Project (Grant number JCYJ20190812161001790) and Shenzhen Fund for Guangdong Provincial Highlevel Clinical Key Specialties.
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XW: conceptualization, investigation, data curation, writing—original draft. YW: investigation. YL: investigation. JW: investigation. RD: investigation. SL: funding acquisition. JL: resources. SY: supervision, project administration. XL: conceptualization, funding acquisition, supervision, writing—review and editing.
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All animal experiments were carried out in accordance with the National Institutes of Health guide for the care and use of Laboratory animals (NIH Publications No. 8023, revised 1978) and approved by the Ethics Committee of the Guangzhou University of Chinese Medicine.
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Wei, X., Wang, Y., Lao, Y. et al. Effects of honokiol protects against chronic kidney disease via BNIP3/NIX and FUNDC1-mediated mitophagy and AMPK pathways. Mol Biol Rep 50, 6557–6568 (2023). https://doi.org/10.1007/s11033-023-08592-1
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DOI: https://doi.org/10.1007/s11033-023-08592-1